Specifications
GDC-350 Operation Manual
12 5909-9000 Rev 3
Figure 3-6. Improper Wiring Example
3.7. Wiring Remote Sensors (Voltage and Signal)
Three (3) conductor, 16 to 18 gauge, stranded wire is required between the control
panel and the remote catalytic or solid state sensor. Under most local electrical
codes, low voltage wires cannot not be run within the same conduit as line voltage
wires. 3-conductor, 16 to 18-gauge wire/cable must be shielded when connecting to a
remote analog transmitter. The remote analog transmitter enclosures have several
conduit entry locations (general purpose enclosure).
NOTE: DO NOT use solid-core wire for connection to wiring terminal
strip. Any damage caused by using solid-core wire will void warranty.
Use stranded wire ONLY.
The voltage supplied by the controller to the remote sensors should measure
approximately 5.0 VDC ±2%, at the remote sensor. Voltage supplied by the controller
to remote analog transmitters should measure approximately 24 VDC nominal. This
voltage is factory set at time of manufacturing. If these voltages are not attained after
installation, the wrong gauge wire may have been used or the wiring run is too long.
The maximum distance between the GDC-350 and the remote sensor is 500 feet.
The remote sensor housing has a 3/4” conduit thread and nut to allow installation in
any standard electrical junction box (to be supplied by the installer). Connect three
low voltage wires between it and the controller and observe polarity.
3.8. Wiring Relay Connections
System relays are dry contacts and designed to operate fan starters or coils to control
equipment that draws more than 5 amps start-up and/or operational current. The
system does not provide any power from these terminals. Dry contacts operate like a
switch to simply activate (switch on) or de-activate (switch off) equipment to be
controlled, such as fan starters.
NOTE: System relays are SPDT (single pole, double throw) thereby
providing one set of usable dry contacts for each relay. Because the
GDC-350 series systems are designed to be fail-safe, any equipment to
be controlled by the system relays should be wired to the “NC” Normally
closed) and “COM” (Common) terminals. The relay coils are normally
energized in non-alarm state for fail-safe operation.